Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ddb6bceae801565…

MALICIOUS

PDF

86.4 KB Created: 2021-07-16 14:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8cfa32fedd57368db91db2af577b3a21 SHA-1: 7a364d514f44e0205dbc369d7adf2e4a4e62f907 SHA-256: 6ddb6bceae8015654b3f2d25e203fc356b7618c30f5b3286854a699d4c24bf77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and the link farm structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://bscartridge.com/pic/32054781288.pdf In PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/76194666757.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/48c0b8fc14c7adb5061bf9fcf4b7dd0f/ruzirenajipadejegunoju.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/44706798512.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/zinotunukiwanomukekuxi.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfee88cd8f---84118883741.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/gadowafazokesomug.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/bipujitanipegixo.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/073fdaaa15243db732644bdd8f253ee9/javepexew.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d660e8499---62343444904.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/78628795022.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/71027715755.pdfIn PDF document text
    • http://medica-brno.com/files/tuwosirurojotifupawuwa.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a9f88f2ed---zalunogugumuw.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/6866085516.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/sitinadesejedezu.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/janemop.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/79831559556.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/4bd1c3c0b8db70925930af532f14636a/10069086351.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4ef7ded9f1bae983fb9da9b4ccc266af/pogukubug.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/162a575819297f22318ee6856fc97a87/87690672.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/vowixabijulilufaxude.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ede6452ba10---92859028321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dickens+rise+chigwellPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 16796 bytes
SHA-256: 36caba30128dc0056832b1eff88cd01c922f946e7a411e81a7a36ce13cd7e5a1
font_02_sfnt_off00013432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13432 10308 bytes
SHA-256: 0e019f2aa6d18d5bd0396384574c0b87518ea6378ffca8a9de11b9251e3f2084

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